Combustion controlling device for furnaces



ay 12, 1936. B G. WOOLLEY 2,040,231

COMBUSTION CONTROLLING DEVICE FOR FURNACES Filed Jan. 12, 1934 3Sheets-Sheet 1 12, 1936. B. G WOOLLEY 2,040,231

COMBUSTION CONTROLLING DEVICE FOR FURNACES Filed Jan. 12, 1934 3Sheets*Sheet 2 ay 12, 1936. B, G. WOOLLEY COMBUSTION CONTROL ING DEVICEFOR FURNACES Filed Jan.

12, 1934 3 Sheets-Sheet 3 f w 1 i k Patented May 12, 1936 PATENT OFFICECOMBUSTION CONTROLLING DEVICE FOR FURNACES Bradford G. Woolley,Providence, R. 1., assignor to Hammel Oil Burning Equipment Company,Inc., Providence, R. I., a corporation of Rhode Island ApplicationJanuary 12, 1934, Serial No. 706,382

17 Claims.

eration and freedom from dangerous conditions liable to result fromoverloading.

Another object of the invention is to provide a device of the typeindicated which is adjustable to meet varying requirements when used inconjunction with furnaces of different types and capacities.

Another object of the invention is to provide a device of the typeindicated which may be operated directly from the draft-controllingmeans of the furnace to insure proper codperation therewith.

Another object of the invention is to provide a device of the typeindicated which is embodied in a single unit adapted for application tofurnaces already in use without material change in their structure.

Another object of the invention is to provide a device of the typeindicated which is of simple and rugged construction to adapt it for useover long periods of time without repair or replacement.

Further objects of the improvement are set forth in the followingspecification which describes a preferred form of construction of theinvention, by way of example, as illustrated by the accompanyingdrawings. In the drawings:

Fig. l is a front elevation of a steam boiler furnace of industrial typeshowing the improved control device as applied to use therewith andconnected to be operated from the draft-regulating means;

Fig. 2 is a side elevation of the same;

Fig. .3 is an enlarged front view of the control device showing therelationship of the parts when adjusted to reduce the feed of oil andsteam to a minimum;

Fig. 4 is a sectional plan view of the control device taken on line 44of Fig. 3;

Fig. 5 is a side view of the control device showing the feed-valvesadjusted to substantially closed position;

Fig. 6 is a similar view showing the valves in full open position toefiect maximum flow of oil and steam to the burner;

Fig. 7 is a combination end and sectional View of the steam-valve takenon line of Fig. 3 with the valve-plug shown in substantially closedposition;

Fig. 8 is a combination end and sectional view through the oil-valvetaken on line 8-8 of Fig. 3 and showing the valve-plug in substantiallyclosed position;

Fig. 9 is a View similar to Fig. '7 showing the steam-valve opened toeffect maximum flow of steam to the burner;

Fig. 10 is a view similar to Fig. 8 illustrating the oil-valve fullyopened to permit maximum flow of oil to the burner; and

Fig. 11 is a perspective view of the valve-plug used in the oil-valve.

The present improved control device comprises, in general, a plate orpanel adapted to be secured to the front of the furnace or boiler andprovided with a pair of valves, one for controlling the supply of oil tothe burner and the other for regulating the feed of steam or air theretofor atomizing the fuel. The valve-panel is generally located at a pointremote from the burner with feed-pipes leading from the control-valves.Means are provided for operating the valves in synchronism to regulatethe supply of fuel and. steam in correct proportion to obtain properburning of the fuel in the furnace. In this manner combustion may bepositively controlled and accurately regulated to meet the variousfiring conditions and steam demands. vInthe following description theterm steam is used in a generic sense as indicating any suitableatomizing agent whether of a liquid or gaseous nature.

Referring first to Figs. 1 and. 2 of the drawings, the steam boilerherein illustrated is of a conventional industrial type enclosed bymasonry 2 and a front plate 3. The front plate 3 is provided with theusual fire-box and ash-pit doors designated 4 and 5, respectively. Theash-pit doors 5 are pivotally mounted on hinge-rods 6 to adapt them tobe swung into open or closed position to control the primary draft tothe furnace. Extending horizontally at the front of the boiler is acontrol-shaft 8 journaled in bearings 9 on the plate 3. The shaft 8carries levers I0 connected to the ash-pit doors or dampers 5 by chains1 I, one end of each chain being attached to a lever l0 and its oppositeend connected to an arm I2 extending laterally from the door 5. Thecontrol-shaft 8 may be manually turned by means of a handle I5 fixed toone end thereof or automatically operated from a suitable motor. Thehandle I5 is provided with a stud l6 passing through an arcuate slot I?in a quadrant I8, see Fig. 2, fastened to the side of one of thebearings 9. A hand-nut IS on the stud I! may be tightened against thequadrant I8 to retain the handle E5 in adjusted position.

At the top of the boiler is a flue 28 in which is rotatably mounted ashaft 2| carrying a butterfly valve or damper 22 adapted to be operatedfrom the control-handle l5. At one end of the damper-shaft 2| is asemi-circular member 23 to which is attached a chain 24 connected at itsopposite end to an arm 25 fast on the controlshaft 8. The damper 22 iscontrolled by meansof a spring or Weight of usual type to cause it toopen when the handle i5 is swung upwardly from the position illustratedin Fig. 2. In addition to operating the dampers in the manner as aboveexplained the handle l5 may also serve to operate the feed-controldevice for the burner by means as later described.

The boiler may be provided with any suitable type of oil-burner nozzle,indicated at 21 in Fig. 1 as projecting into the fire-box of thefurnace. Connected to the outer end of the nozzle 21 are two feed lines28 and 29 leading from the control device, the pipe 28 being for oil andpipe 29 for steam or air. A double indicator 38 at the front of theboiler is connected by tubes 3| and. 32 to the oil and steam feed-pipes28 and 29 to register the pressure in each. The control device forregulating the supply of oil and steam to the burner is constructed andarranged as next described.

Secured to the front plate 3 of the boiler by means of bolts 34 is asmall plate or panel 33. The bolts 34 pass through the corners of thepanel 33 and through tubes 35 which space the panel outwardly from thefront plate 3 to insulate it from heat and also to provide room for theoil and steam supply-pipes 36 and 31 which are connected to the rear ofthe panel. As shown in Figs. 4 and 5 the panel 33 is provided withcircular bosses 38 and 39 having threaded bores extending through thepanel. Screwed into the rearward ends of the bosses 38 and 39 are thesupply-pipes 38 and 31 for oil and steam; the oil feed line 38 leadingfrom a suitable source of sup-ply and the steam pipe 31 from the boiler.Shut-off valves l3 and M are provided in the lines 36 and 31 formanually shutting off the feed. Connected to the forward ends of thebosses 38 and 39 by nipples 4! are oil and steam control-valves 48 and58. As both valves are similar in construction only one will be hereindescribed in detail.

Referring to Fig. 4, the valve 48 comprises a body 42 in the shape of a.cross having two branches disposed in right angular relationship.Communicating with the supply-pipe 36 through the nipple 4| is an inletpassage 43 and opposite thereto is an outflow passage leading to thefeed-pipe 28 which connects with the burnernozzle 21. The flow of theoil through the passage 43 is regulated by a valve-stem 44 extendingtransversely thereof.

The valve-stem 44, shown in detail in Fig. 11, comprises a cylindricalbody-portion with a reduced shank 46 projecting axially therefrom.Extending diametrically through the body-portion of the, stem 44 is aport 41 of substantially triangular shape in cross-section, see Fig. 10,adapted to register with the inlet 43 when the stem is turned in thevalve-body 42. As shown in Fig. 4, the shank portion of the valve-stem44 is fitted to a bore 48 in the valve-body 42 and its enlarged portionseats in a counterbore 49 extending from the opposite side thereof.

The inner end of the counterbore 43 is tapered slightly to form a seat5! for receiving the enlarged portion of the valve-stem 44 which iscorrespondingly tapered as shown at 52. Screwed into an enlargedthreaded counterbore 55 in the end of the valve-casing 42 is a plug 53.Pocketed in an axial hole 5? in the plug is a spring 58 which bearsagainst the end of the enlarged portion of the valve-stem 44 to maintainits opposite tapered end 52 firmly seated in the tapered end 5| of thecounterbore 49 to form a seal for preventing leakage. As a furtherprevention against leakage around the valve-stem a stufiing box isprovided. The valve-body is formed with a projecting gland 59 enclosinga suitable packing 88 compressed in the gland by a sleeve 6| held by anadjusting nut 62 screwed onto the threaded end of the gland.

Referring now to Figs. 3 and 7 to inclusive, the triangular openings orports 41 in the steam and oil valve-stems are oppositely disposed. Thatis to say, the apexes of the triangular holes point in oppositedirections so that When the valvestems are turned in opposite directionsthe two valves 48 and 58 are concurrently opened or concurrently closed.The means for turning the valve-stems to open and close the valves areconstructed and arranged as next described.

Extending lengthwise of the panel 33 at rightangles to the valve-stems44 is a projecting rib or pad 85 provided with a substantially T-shapedslot or guideway 63. Slidably mounted in the guideway 68 is a bar 61connected to operate the valves 48 and 58 either from the control-shaft8 or a handwheel 88 to be later described. Communicating with theguideway 66 is a narrower slot 88 for receiving a gear-rack l8 fastenedto the rearward side of the bar 51 by means of screws H, see Figs. 4 and6.

As shown in Fig. 6 a pinion i2 meshes with the gear-rack 18 and byturning the pinion the rack and its attached slide-bar 3! may be movedlongitudinally of the panel 33. The pinion I2 is carried on or formedintegral with a shaft or spindle l3 rotatably mounted in a bore 14 inthe panel 33 which extends at right-angles to the guideway 86 at therear thereof. The pinion 12 is slightly larger in diameter than thespindle l3 and a bushing iii in the bore i4 engages its inner end toretain the spindle in place in the bore. fhe bushing 75 constitutes abearing for the spindle 13, being held in place in the bore 14 by meansof a set-screw 16. A collar 'i'i secured to the spindle 13 by aset-screw E8 abuts the side of the panel 33 to take the thrust of thespindle T3 in the opposite direction. Secured to the projecting end ofthe shaft 13 is a handwheel 88, previously referred to, which serves asthe means for rotating the pinion 72 to slide the bar Bl in its guideway85. The handwheel 88 is employed for manually adjusting the feed-valvesindependently of the draft-regulating handle l5, previously described.When the control-handle I5 is manipulated to regulate the draft in thefurnace the bar 6? is simultaneously actuated to open or close theValves 48 and 58. Connected to the upper end of the bar 5'! is a link8|, see Figs. 1 and 2, which is pivotally joined to a lever 83 on thecontrol-shaft 8.

' bore.

Detachably secured to the slide-bar 61 are two valve-operating cams 84and 85. Referring to Figs. 3, 5 and 6, the cams 84 and 85 areconstituted by relatively thin bars or bendable strips shaped to extendat predetermined angles in relation to the bar 61. At their outer endsthe cam-strips 84 and 85 are slotted to receive studs or screws 86inserted through the ends of the slide-bar 61. As herein shown the headsof the screws 86 fit within countersunk holes in the rearward side ofthe bar 61 with the threaded ends of the screws projecting forwardly toreceive nuts 81 screwed against the bar. The slotted ends of thecam-strips 84 and 85 are detachably fastened against the nuts 81 bymeans of bindernuts 88 screwed down thereagainst. The oppositeoverlapping ends of the cam-strips 84 and 85 are secured to a longerstud 89 projecting forwardly from the slide-bar 61 to extend throughtheir slots. The stud 89 is screwed into a threaded hole in theslide-bar 61 and on its outer threaded end are nuts 90, 9| and 92,between which the ends of the cam-strips 84 and B5 are clamped. It willbe observed by reference to Figs. 5 and 6 that the inner ends of thecams 84 and 85 are disposed at different distances from the slide-bar81; the steam-valve control cam 85 being of slightly greater inclinationor pitch than the cam 84 which controls the opening and closing of theoil-valve 40.

Secured to the outer extremities of the valvestems 44 are arms or levers95 and 96. The arms 95 and 96 have split hubs 91 clamped to the stems 44by binder-screws 98. Each arm 95 or 96 is formed at its end with a yoke99 between the sides of which is a roller I journaled on a pin MI. Therollers I00 are adapted to ride up and down the incline of the cams 84and 85 to turn the valve-stems when the slide-bar 61 is moved in eitherdirection.

The arms or levers 95 and 96 are maintained with their rollers I00 inengagement with the cams 84 and 85 under the action of spring-controlledplunger-rods I05. Referring to Fig. 4 of the drawings the plunger-rods Islide through holes I06 in the panel 33, being provided with helicalsprings I I6 enclosing their projecting ends and held under compressionby washers H5 and nuts H1. The rods I05 are connected to the arms orlevers 95 and 96 by articulated joints embodied in heads I01 at theends-of the rods. One side of each head I01 is slotted to receive thespherical end III] of a stud I09 screwed into the side of the arm 95 or96, as the case may be. The spherical head IIO of the stud fits within abore I08 in the head or socketed end I01 of the rod I05. A plunger IIIformed with a concaved recess is slidably held within the bore I08 andpressed against the head IIO of the stud I09 by means of a helicalspring H2 pocketed in the The bore I08 is threaded to receive a plug II3screwed thereinto to take the thrust of the head IIO under the pressureof the springplunger III.

Through the above described ball-and-socket joints the plunger-rods I05are connected to the arms or levers 95 and 96 to maintain their rollersI00 continuously in engagement with the cams 84 and 85. The upwardsliding movement of the bar 81 causes the arm 95 to be turned inclockwise direction by the cam 84 and the arm 96 to be rocked in theopposite direction by the cam 85; while movement of the bar in theopposite direction effects a reverse rocking motion of each of the arms.The arrangement of the .while, the steam-valve 50 opened by the samemovement of the bar 61 control device having now been described indetail its method of operation will next be explained.

Assuming that the feed-controlling or regulating device is connected tobe operated from the control-shaft 8 and that the control-handle I5 isin lowermost position as shown in Figs. 1 and 2, the valve-stems 44 ofthe feed-valves will be in a substantially closed position. That is tosay, with the slide-bar 61 in lowermost position as illustrated in Fig.5 the valve-arm 96 will be held depressed under the action of itsplungerrod I05 while the arm 95 is rocked outwardly away from the panel33. To start combustion in the fire-box of the boiler the valves I3 andI4 in the oil and steam supply-lines 36 and 31 are first opened to causethe oil and steam to be supplied under pressure to the control device.Referring to Figs. '1 and 8 of the drawings, it is noted that the oiland steam feed-valves 40 and 50 are never entirely closed, the arms 95and 96 being so adjusted on the valve-stems 44 that there is a slightorifice through the triangular ports 41 into the outlet passage of thevalves. For this reason a small amount of oil and steam will be suppliedto the burner-nozzle 21 by way of the feed-pipes 28 and 29 to be ignitedin the usual manner. To increase the feed of fuel and steam to theburner the binder-stud I6 on the controlhandle I5 is loosened and thehandle swung upwardly from the position shown in Fig. 2. As the handleI5 is raised the control-shaft 8 is rotated in a clockwise direction, asviewed in Fig. 2, and through the chain connections II the lower dampersor ash-pit doors 5 are opened. Concurrently with the opening of thedoors 5 the flue-damper 22 is released to be opened by means of itsspring or weight, not herein shown.

During the turning of the shaft 8 the arm 83 is raised and through meansof the link 8| the bar 61 is slid upwardly in its guideway 66 on thepanel 33. As the bar 61 and its attached valvecontrolling cams 84 and 85are operated in this manner the feed-valves 40 and 50 are opened byturning their stems 44 in opposite directions as previously explained.Referring to Figs. 5 and 6, as the bar 61 is elevated the roller I00 onthe arm 95 rides down the incline of the cam 84 under the action of itsplunger-rod I05 and the valve-stem 44 is rotated in clockwise directionto cause its triangular port 41 to more completely register with thepassage 43 in the valve-body 42 as shown in Fig. 10. The oil-valve 40may thus be opened to its full extent to effect maximum feed of the oilto the burner 21. Meanis simultaneously and the action of the cam 85. Asthe cam 85 moves upwardly the roller I00 carried by the arm 96 rides upthe incline of the cam. The arm 96 together with the valve-stem 44 ofthe valve 50 are thus rotated in counterclockwise direction tending toaline the triangular port 41 with the passage 43 in the valve casing 42in the manner as illustrated in Fig. 9 to effect increased feed of thesteam or air to the burner-nozzle 21. As the fuel-oil enters theburner-nozzle under pressure it is atomized by the steam or air andsprayed into the fire-box of the boiler where combustion takes place.

After sufiicient steam pressure has been generated in the boiler thesupply of oil and steam may be reduced and the draft proportionatelydiminished. To accomplish this regulation the operator simply depressesthe control-handle [5 to partly close the dampers 5 and 22 andsimultaneously lower the slide-bar 61. As the bar 61 is slid downwardly,for example to lowest position as shown in Figs. 3 and 5, the cam 84rocks the arm 95 to turn the valve-stem 44 in counterclockwise directionto partially close the port 41 of the oil-valve 40 as indicated in Fig.8. Concurrently therewith the arm 96 will be rocked to turn thevalvestem 44 in the steam-valve 50 in clockwise direction to partiallyclose its port 4? as shown in Fig. '7. It will be understood that thevalves it and 5E! and the dampers 5 and 22 may be accurately adjusted toa mean operating position as determined by the steam pressure necessaryto supply the demand. This is accomplished by turning the handle I5 todifferent positions between the extremes of movement above described.

It has been explained that in the present embodiment of the inventionthe pitch or angle of inclination of the steam-controlling cam 85 isgreater than that of the oil-regulating cam 84. This provides that thesteam-valve 50 will be 25 opened and closed more quickly than theoilvice.

valve 45. This condition is desirable in the operation of certain typesof steam boilers and for meeting their particular requirements. Theproportionate rates of movement of the valve-stems '44, may, however, bevaried to meet other requirements when the control device is applied touse with steam boilers of different capacities, such adjustment beingmade when installing the de- Cam-strips 84 and 85 of various shapes maybe supplied and assembled on the bar 61 as needed or, in otherinstances, the strips may be bent to the required contour to effect thedesired inclination before application of the device to the boiler.

The control unit may be arranged to be operated automatically by asuitable motor, either electric or hydraulic, controlled by thedeveloped steam-pressure to regulate the dampers and feedvalves tomaintain a predetermined pressure in the boiler.

The present improved device is adaptable for general use in controllingcombustion in furnaces supplied with liquid fuel and atomized by meansof steam or air. In other instances it may be applied to use foradjusting a single feed-valve by dispensing with one of the cams. It mayalso be used in conjunction with feed-valves employed for other purposesin various arts.

The device is positive in operation and when once adjusted to meet thepredetermined conditions it requires practically no attention on thepart of the operator. When the device is operated from thedraft-controlling means the control-shaft 3 may extended along the frontof a battery of boilers and the combustion in the several boilerssimultaneously regulated from a single panel with feed-pipes leading toeach of the burners.

The improved device synchronizes the control of the supply of oil andsteam tothe burner or burners to accurately limit the feed of the fueland steam or air to the minimum required for any load. The oil and steamvalves are positively opened and closed by the interlocked cams, thusgiving each valve its own degree of opening. The cams may be readilyadjusted to compensate for Wear or change in operation conditions.

With the use of the present improved device the hazardous conditionresulting from overloading is entirely eliminated since the rate of feedof the fuel to the burner is positively controlled at all times and itis impossible to increase the flow of the oil without simultaneouslyincreasing the flow of the atomizing agent. The device thus makes forgreater eificiency in operation and results in a. substantial saving offuel by eliminating waste.

While I have herein shown and described the improvedcombustion-controlling device as embodied in a preferred form ofconstruction and applied to use with a particular type of boiler, it isto be understood that various modifications may be made in the structureof the device and. its application to use without departing from thespirit or scope of the invention. Therefore, without limiting myself inthis respect, I claim:

1. In combination with a furnace, a burner therefor, a conduit forfeeding fuel to the burner, a valve in said conduit for controlling thefeed, a second conduit for feeding air or steam to atomize the fuelsupplied to the burner, a valve in said second conduit for controllingthe lastname-d feed, cams for operating said valves in synchronism, anda slide having a straight line motion for actuating the cams in unison.

2. In combination with a furnace, a burner therefor, a conduit forfeeding fuel to the burner, a valve in the conduit for controlling thefeed, a second conduit for feeding air or steam to atomize the fuelsupplied to the burner, a valve in the I second conduit for controllingthe flow of the medium therein, cams for operating said valves insynchronism, a slide for actuating the cams in unison, dampers forcontrolling the draft in the furnace, means for operating said dampers,and

means connecting said damper-operating means and slide to move thelatter to actuate the cams for the valves.

3. In a control device for furnaces, the combination of a pair ofconduits, one for fuel and another for or steam, valves for regulatingthe flow of fluid through each conduit, a plurality of cams foroperating the valves, means for actuating the cams to open and close thevalves in unison, and means for independently adjusting the cams at oneend to regulate the ratio of adjustment of the valves during theirsynchronous operation from the cams.

i. In a control device for furnaces, the combination of a pair ofconduits, one for fuel and another for air or steam, valves forregulating the feed through each conduit, a panel, a slide slidable onthe panel, cams mounted on said slide and engageable with the valves toactuate the latter in unison, and means to slide the slide on the panel.

5. In a control device for furnaces, the combination of a pair ofconduits, one for fuel and another for air or steam, valves forregulating the feed through each conduit, a panel, a slide slidab-le onthe panel, a rack on the slide, a pinion engaging the rack to slide theslide, means for turning the pinion, and cams on the slide engageablewith the valves to actuate the latter during the movement of the slide.

6. In a control device for furnaces, the combination of a pair ofvalves, one for fuel and another for air or steam, a lever forcontrolling each valve, a slide, cams mounted on the slide andadjustable in angular relation thereto, means on the levers engaging thecams, rods attached to the levers, and springs acting on said rods tomaintain the levers in engagement with the cams during the movement ofthe slide.

'7. In a control device for furnaces, the combination of separateconduits for feeding fuel and an atomizing medium, a valve in eachconduit for regulating the flow of the medium therein, actuators for thevalves, a reciprocable slide adjacent the actuators, inclined cams onsaid slide engaged by the respective valve-actuators to open or closethe valves upon movement of the slide, and means for adjusting the camsat one end to vary the inclination thereof throughout their length.

8. In a control device for furnaces, the combination of separateconduits for feeding fuel and an atomizing medium, a valve in eachconduit for regulating the flow of the medium therein, actuators for thevalves, a reciprocable slide adjacent the actuators, flexible strips onsaid slide inclined with respect to its direction of movement andengaging the valve-actuators, and adjusting means at the end of thestrips for varying the inclination of said strips.

9. In a control device for furnaces, the combination of separateconduits for feeding fuel and an atomizing medium, a valve in eachconduit for regulating the flow of the medium therein, actuators for thevalves, a reciprocable slide adjacent the actuators, cams mounted onsaid slide in inclined position with respect to the direction ofmovement thereof, resilient means for holding the valve-actuators inengagement with the cams, and means at the end of the cams for adjustingthe inclination thereof whereby said valves are variably actuated bymovement of the slide to regulate the proportions of fuel and airsupplied to the furnace.

10. In a control device. for furnaces, the combination of separateconduits for feeding fuel and an atomizing medium, a valve in eachconduit for regulating the flow of the medium therein, said valves beingoperable in opposite directions to open or close the conduits, actuatorsfor the valves, and movable cams inclined in opposite directions andengaged by the respective valveactuators whereby the valves are operatedin opposite directions to simultaneously open the conduits when the camsare moved in one direction and simultaneously close the conduits whenthe cams are moved in the opposite direction.

11. In a control device for furnaces, the combination of separateconduits for feeding fuel and an atomizing medium, a valve in eachconduit for regulating the flow of the medium therein, said valves beingoperable in opposite directions to open or close the conduits, actuatorsfor the valves, a slide adjacent the actuators, cams on the slide havingoppositely inclined faces engaged by the actuators, and means foradjusting the inclination of the cams, said valves being actuated inopposite directions by movement of the slide to simultaneously open orclose the conduits.

12. In a control device for furnaces, the combination of separateconduits for feeding fuel and an atomizing medium, a valve in eachconduit for regulating the flow of the medium therein, said valves beingoperable in opposite directions to open or close the conduits, actuatorsfor the valves, a slide adjacent the actuators, cams on said slidehaving faces inclined in opposite directions to a common peak, and meansat one end of the cams for adjusting their inclination throughout theirlength, said cams engaging the respective valveactuators tosimultaneously open or close the valves upon movement of the slide inopposite directions.

13. In a control device for furnaces, the combination of separateconduits for feeding fuel and an atomizing medium, a valve in eachconduit for regulating the flow of the medium therein, said valves beingoperable in opposite directions to open or close the conduits, actuatorsfor the valves, a slide adjacent the actuators, oppositely inclined camson said slide, and resilient means for holding the valve-actuators inengagement with the respective cams whereby the valves are operated inopposite directions to simultaneously open or close the conduits uponmovement of the slide.

14. In a control for furnaces, the combination of separate conduits forfeeding fuel and an atomizing medium, a valve in each conduit forregulating the flow of the medium therein, said valves being operable inopposite directions to open or close the conduits, levers for actuatingthe valves to open or close the conduits, a slide adjacent the levers,oppositely inclined cams on the slide, and resilient means for holdingthe levers in contact with the respective cams, said valves beingoperated in opposite directions upon movement of the slide in eitherdirection by the engagement of the actuating levers with the cams.

15. In a control device for furnaces, a panel, separate conduitsextending through the panel for feeding fuel and an atomizing medium, avalve in each conduit for regulating the flow of the medium therein,actuators for said'valves adjacent said panel, a slide on said panelhaving cam faces for engaging the respective valve-actuators, andmanually-operable means for reciprocating the slide on the panel tosimultaneously actuate the valves.

16. In a control'device for furnaces, a panel, separate conduitsextending through the panel for feeding fuel and an atomizing medium, avalve in each conduit for regulating the flow of the medium therein,actuators for said valves adjacent said panel, a slide on said panelhaving cam faces for engaging the respective valve-actuators, a damperfor the furnace, means for connecting the damper with the slide, andmanuallyoperable means for reciprocating the'slide to s1- multaneouslyactuate the valves and the damper.

17. In a control device for furnaces, a panel, separate conduitsextending through the panel for feeding fuel and an atomizing medium, avalve in each conduit for regulating the flow of the medium therein,said valves being operable in opposite directions to open or close thecon-duits, actuators for said valves adjacent said panel, a slide onsaid panel, cams on said slide having oppositely inclined faces engagedby the respective valve-actuators, a damper for the furnace, means forconnecting the damper with the slide, and manually-operable means forreciprocating the slide to simultaneously actuate the damper and thevalves in opposite directions.

BRADFORD G. WOOLLEY.

